Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 71b8e23454b633aa…

MALICIOUS

RTF / .DOC

341.2 KB
MD5: dc702ad7418eb6e2879750b78256717a SHA-1: 4ed2ea6c4e5cb2d72bd6098f69e83d14b0a83523 SHA-256: 71b8e23454b633aaefc4f6e55426b75be7e02882117fb16b9db260b0b4c33283
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1203 Exploitation for Client Execution

The RTF document contains multiple indicators of malicious OLE object embedding, including composite monikers and automatic linking, strongly suggesting exploitation of CVE-2017-8570. The document body explicitly instructs the user to 'download the document and click Enable Editing', a typical lure to bypass security measures and execute embedded malicious content, likely a script.

Heuristics 7

  • Composite Moniker — CVE-2017-8570 (drops SCT script) critical CVE related CVE_2017_8570
    RTF \objdata decodes to OLE data containing the Composite Moniker — CVE-2017-8570 (drops SCT script) CLSID — the vulnerable control/moniker is embedded directly in the document's object stream, the delivery shape of this exploit. RTF objects auto-render when Word opens the file.
  • Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED
    RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • OLE object data medium RTF_OBJDATA
    RTF contains 3 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000969.bin
f4f97d3daedbfea27b71dfa078d30d4e15db2f1eed0ffef99c4d07ecb4b99be6		 rtf-objdata-decoded RTF \objdata at offset 0x969 75732 bytes
objdata_01_off0002715c.bin
f4c761490fd63fc4aa791746a9a2b588dafd9e2c764f57f0c85377b99ef07062		 rtf-objdata-decoded RTF \objdata at offset 0x2715C 2632 bytes
objdata_02_off000286ff.bin
44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037		 rtf-objdata-decoded RTF \objdata at offset 0x286FF 12297 bytes

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